<!DOCTYPE html>
<html>
<body>
<p>This tests inserting or removing shadow tree with slot elements do not cause a crash.</p>
<script>

if (window.testRunner)
    testRunner.dumpAsText();

function addShadowWithSlot() {
    var host = document.createElement('div');
    var shadowRoot = host.attachShadow({mode: 'open'});
    var slot = document.createElement('slot');
    shadowRoot.appendChild(slot);
    document.body.appendChild(host);

    slot.remove();
    slot.setAttribute('name', 'foo');
}

function removeShadowWithSlot() {
    var container = document.createElement('div');
    document.body.appendChild(container);

    var host = document.createElement('div');
    container.appendChild(host);

    var shadowRoot = host.attachShadow({mode: 'open'});
    var slot = document.createElement('slot');
    shadowRoot.appendChild(slot);

    container.remove();
    host.remove();
}

function removeNestedShadowsWithSlot() {
    var outerHost = document.createElement('div');
    document.body.appendChild(outerHost);
    
    var outerShadow = outerHost.attachShadow({mode: 'open'});
    var innerHost = document.createElement('div');
    outerShadow.appendChild(innerHost);

    var innerShadow = innerHost.attachShadow({mode: 'open'});
    var slot = document.createElement('slot');
    innerShadow.appendChild(slot);

    outerHost.remove();
    innerHost.remove();
}

addShadowWithSlot();
removeShadowWithSlot();
removeNestedShadowsWithSlot()
document.write('PASS');

</script>
</body>
</html>